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Genoplesium turfosum D.L.Jones
Family Orchidaceae
Genoplesium turfosum D.L.Jones APNI*

Synonyms: Corunastylis turfosa (D.L.Jones) D.L.Jones & M.A.Clem. APNI*

Description: Terrestrial tuberous herb.

Leaf 5–13 cm long by 3–4 mm wide, terete; free portion of lamina 8–12 mm long by 3 mm wide.

Inflorescence 6–15 cm tall, with 2–20 closely spaced flowers on a spike 8–20 mm long. Flowers c. 4 mmwide, nodding, dark purple-red. Dorsal sepal narrow-ovate, c. 3.5 mm long by 2 mm wide, triangular-ovate, apex acute, purple-red with darker stripes and marginal band, margins entire. Lateral sepals linear-lanceolate, slightly falcate, c. 4.5 mm long by 1.4 mm wide, with cucullate apex, not gibbous at the base, widely divergent, obliquely erect. Petals narrow-ovate, c. 3 mm long by 1.3 mm wide, striped, apex obtuse to apiculate, margins entire. Labellum dark purplish, rhomboid-ovate to ovate with a hint of spathulate, c. 2.5–3 mm long by 1.5 mm wide, apex recurved, margins with sparse, blackish, ciliate trichomes 0.5–1.0 mm long; callus dark purple-black, broader at the base, then narrowed to a lanceolate distal half that extends to near the labellum apex. Column 1.6 mm long, with purple wash, wings undivided, apex formed by lower lobe, truncate, bearing short cilia on margin and surface, margin below apex dilated.

Flowering: Recorded flowering in November and December.

Distribution and occurrence: Grows among dense sedges in subalpine swamps; restricted to the Adaminaby-Kiandra region.
NSW subdivisions: ST
AVH map***

Genoplesium turfosum is a distinctive species that can be recognised by the combination of: 1) sparsely hairy labellum margins, the hairs of which are dark purple-black; 2) the absence of hairs on the margins of other floral segments; 3) the dark labellum with darker callus that tapers from a broad base in a long, lanceolate upper portion that extends nearly to the labellum apex; 4) the undivided column wings, with a truncate apex formed by what is normally the lower lobe, in this case the upper and lower lobes are completely fused along the whole inner margin of the shorter upper lobe; 5) the rhomboid-ovate labellum, which is rather broad for its length.

Text by D.L. Jones, with modification by Matt A.M. Renner (17 June 2020).
Taxon concept: Flora of NSW 4 (1993); Jones (1991) New taxa of Australian Orchidaceae. Australian Orchid Research 2: 1-208.

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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